diff options
Diffstat (limited to 'kernel/sound/pci/oxygen/oxygen_io.c')
| -rw-r--r-- | kernel/sound/pci/oxygen/oxygen_io.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/kernel/sound/pci/oxygen/oxygen_io.c b/kernel/sound/pci/oxygen/oxygen_io.c new file mode 100644 index 000000000..c7851da37 --- /dev/null +++ b/kernel/sound/pci/oxygen/oxygen_io.c @@ -0,0 +1,292 @@ +/* + * C-Media CMI8788 driver - helper functions + * + * Copyright (c) Clemens Ladisch <clemens@ladisch.de> + * + * + * This driver is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2. + * + * This driver is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this driver; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/export.h> +#include <linux/io.h> +#include <sound/core.h> +#include <sound/mpu401.h> +#include "oxygen.h" + +u8 oxygen_read8(struct oxygen *chip, unsigned int reg) +{ + return inb(chip->addr + reg); +} +EXPORT_SYMBOL(oxygen_read8); + +u16 oxygen_read16(struct oxygen *chip, unsigned int reg) +{ + return inw(chip->addr + reg); +} +EXPORT_SYMBOL(oxygen_read16); + +u32 oxygen_read32(struct oxygen *chip, unsigned int reg) +{ + return inl(chip->addr + reg); +} +EXPORT_SYMBOL(oxygen_read32); + +void oxygen_write8(struct oxygen *chip, unsigned int reg, u8 value) +{ + outb(value, chip->addr + reg); + chip->saved_registers._8[reg] = value; +} +EXPORT_SYMBOL(oxygen_write8); + +void oxygen_write16(struct oxygen *chip, unsigned int reg, u16 value) +{ + outw(value, chip->addr + reg); + chip->saved_registers._16[reg / 2] = cpu_to_le16(value); +} +EXPORT_SYMBOL(oxygen_write16); + +void oxygen_write32(struct oxygen *chip, unsigned int reg, u32 value) +{ + outl(value, chip->addr + reg); + chip->saved_registers._32[reg / 4] = cpu_to_le32(value); +} +EXPORT_SYMBOL(oxygen_write32); + +void oxygen_write8_masked(struct oxygen *chip, unsigned int reg, + u8 value, u8 mask) +{ + u8 tmp = inb(chip->addr + reg); + tmp &= ~mask; + tmp |= value & mask; + outb(tmp, chip->addr + reg); + chip->saved_registers._8[reg] = tmp; +} +EXPORT_SYMBOL(oxygen_write8_masked); + +void oxygen_write16_masked(struct oxygen *chip, unsigned int reg, + u16 value, u16 mask) +{ + u16 tmp = inw(chip->addr + reg); + tmp &= ~mask; + tmp |= value & mask; + outw(tmp, chip->addr + reg); + chip->saved_registers._16[reg / 2] = cpu_to_le16(tmp); +} +EXPORT_SYMBOL(oxygen_write16_masked); + +void oxygen_write32_masked(struct oxygen *chip, unsigned int reg, + u32 value, u32 mask) +{ + u32 tmp = inl(chip->addr + reg); + tmp &= ~mask; + tmp |= value & mask; + outl(tmp, chip->addr + reg); + chip->saved_registers._32[reg / 4] = cpu_to_le32(tmp); +} +EXPORT_SYMBOL(oxygen_write32_masked); + +static int oxygen_ac97_wait(struct oxygen *chip, unsigned int mask) +{ + u8 status = 0; + + /* + * Reading the status register also clears the bits, so we have to save + * the read bits in status. + */ + wait_event_timeout(chip->ac97_waitqueue, + ({ status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS); + status & mask; }), + msecs_to_jiffies(1) + 1); + /* + * Check even after a timeout because this function should not require + * the AC'97 interrupt to be enabled. + */ + status |= oxygen_read8(chip, OXYGEN_AC97_INTERRUPT_STATUS); + return status & mask ? 0 : -EIO; +} + +/* + * About 10% of AC'97 register reads or writes fail to complete, but even those + * where the controller indicates completion aren't guaranteed to have actually + * happened. + * + * It's hard to assign blame to either the controller or the codec because both + * were made by C-Media ... + */ + +void oxygen_write_ac97(struct oxygen *chip, unsigned int codec, + unsigned int index, u16 data) +{ + unsigned int count, succeeded; + u32 reg; + + reg = data; + reg |= index << OXYGEN_AC97_REG_ADDR_SHIFT; + reg |= OXYGEN_AC97_REG_DIR_WRITE; + reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT; + succeeded = 0; + for (count = 5; count > 0; --count) { + udelay(5); + oxygen_write32(chip, OXYGEN_AC97_REGS, reg); + /* require two "completed" writes, just to be sure */ + if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_WRITE_DONE) >= 0 && + ++succeeded >= 2) { + chip->saved_ac97_registers[codec][index / 2] = data; + return; + } + } + dev_err(chip->card->dev, "AC'97 write timeout\n"); +} +EXPORT_SYMBOL(oxygen_write_ac97); + +u16 oxygen_read_ac97(struct oxygen *chip, unsigned int codec, + unsigned int index) +{ + unsigned int count; + unsigned int last_read = UINT_MAX; + u32 reg; + + reg = index << OXYGEN_AC97_REG_ADDR_SHIFT; + reg |= OXYGEN_AC97_REG_DIR_READ; + reg |= codec << OXYGEN_AC97_REG_CODEC_SHIFT; + for (count = 5; count > 0; --count) { + udelay(5); + oxygen_write32(chip, OXYGEN_AC97_REGS, reg); + udelay(10); + if (oxygen_ac97_wait(chip, OXYGEN_AC97_INT_READ_DONE) >= 0) { + u16 value = oxygen_read16(chip, OXYGEN_AC97_REGS); + /* we require two consecutive reads of the same value */ + if (value == last_read) + return value; + last_read = value; + /* + * Invert the register value bits to make sure that two + * consecutive unsuccessful reads do not return the same + * value. + */ + reg ^= 0xffff; + } + } + dev_err(chip->card->dev, "AC'97 read timeout on codec %u\n", codec); + return 0; +} +EXPORT_SYMBOL(oxygen_read_ac97); + +void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec, + unsigned int index, u16 data, u16 mask) +{ + u16 value = oxygen_read_ac97(chip, codec, index); + value &= ~mask; + value |= data & mask; + oxygen_write_ac97(chip, codec, index, value); +} +EXPORT_SYMBOL(oxygen_write_ac97_masked); + +static int oxygen_wait_spi(struct oxygen *chip) +{ + unsigned int count; + + /* + * Higher timeout to be sure: 200 us; + * actual transaction should not need more than 40 us. + */ + for (count = 50; count > 0; count--) { + udelay(4); + if ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & + OXYGEN_SPI_BUSY) == 0) + return 0; + } + dev_err(chip->card->dev, "oxygen: SPI wait timeout\n"); + return -EIO; +} + +int oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data) +{ + /* + * We need to wait AFTER initiating the SPI transaction, + * otherwise read operations will not work. + */ + oxygen_write8(chip, OXYGEN_SPI_DATA1, data); + oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8); + if (control & OXYGEN_SPI_DATA_LENGTH_3) + oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16); + oxygen_write8(chip, OXYGEN_SPI_CONTROL, control); + return oxygen_wait_spi(chip); +} +EXPORT_SYMBOL(oxygen_write_spi); + +void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data) +{ + /* should not need more than about 300 us */ + msleep(1); + + oxygen_write8(chip, OXYGEN_2WIRE_MAP, map); + oxygen_write8(chip, OXYGEN_2WIRE_DATA, data); + oxygen_write8(chip, OXYGEN_2WIRE_CONTROL, + device | OXYGEN_2WIRE_DIR_WRITE); +} +EXPORT_SYMBOL(oxygen_write_i2c); + +static void _write_uart(struct oxygen *chip, unsigned int port, u8 data) +{ + if (oxygen_read8(chip, OXYGEN_MPU401 + 1) & MPU401_TX_FULL) + msleep(1); + oxygen_write8(chip, OXYGEN_MPU401 + port, data); +} + +void oxygen_reset_uart(struct oxygen *chip) +{ + _write_uart(chip, 1, MPU401_RESET); + msleep(1); /* wait for ACK */ + _write_uart(chip, 1, MPU401_ENTER_UART); +} +EXPORT_SYMBOL(oxygen_reset_uart); + +void oxygen_write_uart(struct oxygen *chip, u8 data) +{ + _write_uart(chip, 0, data); +} +EXPORT_SYMBOL(oxygen_write_uart); + +u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index) +{ + unsigned int timeout; + + oxygen_write8(chip, OXYGEN_EEPROM_CONTROL, + index | OXYGEN_EEPROM_DIR_READ); + for (timeout = 0; timeout < 100; ++timeout) { + udelay(1); + if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS) + & OXYGEN_EEPROM_BUSY)) + break; + } + return oxygen_read16(chip, OXYGEN_EEPROM_DATA); +} + +void oxygen_write_eeprom(struct oxygen *chip, unsigned int index, u16 value) +{ + unsigned int timeout; + + oxygen_write16(chip, OXYGEN_EEPROM_DATA, value); + oxygen_write8(chip, OXYGEN_EEPROM_CONTROL, + index | OXYGEN_EEPROM_DIR_WRITE); + for (timeout = 0; timeout < 10; ++timeout) { + msleep(1); + if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS) + & OXYGEN_EEPROM_BUSY)) + return; + } + dev_err(chip->card->dev, "EEPROM write timeout\n"); +} |